600 mm2 = 6 × 10 mm × 10 mm = 6 × 1 cm × 1 cm = 6 cm2
2 dm2 = 2 × 1 dm × 1 dm = 2 × 10 cm × 10 cm = 200 cm2
4 m2 = 4 ×1 m × 1 m = 4 × 100 cm × 100 cm = 40000 cm2
1 m2 12 cm2 = 10000 cm2 + 12 cm2 = 10012 cm2
1 m2 = 1 m ×1 m = 100 cm × 100 cm = 10000 cm2